This is the Express Motorsports "Kill Shot Animal" 17.5 Turn RPM Brushless Motor. The "Animal" includes a high rpm 17.5 stator, combined with a 12.5mm High Torque rotor that delivers improved overall power and increased RPM when compared to the standard Kill Shot 17.5 motor. The Kill Shot Animal motors have been tweaked to extract every bit of power from Trinity's RevTech Kill Shot line. This includes checking the strength of the rotor and the inductance of the stator, and then matching the best rotors with the best stators. They are also checked for any defects, proper bearing alignment and shimming. This provides you with a reliable blueprinted motor that has all the same tweaks as the motors driven by Express team drivers, ensuring the motor you receive makes optimum power.